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a kalk reactor is not really made to be dosed via a probe as doing it that way will add to much RO water, just do it via auto top up and it can run all day, but just have the stirrer pump on a timer so that during the day it will settle and be settled

Second question is how do you work out evaporation amounts? Isn't it dependant on heat, fans blowing on tank etc etc etc

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Good question, also sounds very confusing to me. I would go with what @dallasg said. I am also getting a reef octo kalk stirrer and Idol marine are setting up mine via the water top up, will also run it on a timer like Dallas said.

Peri best as least hassles and better control of drip rate. Using small impellor driven pumps with airhose taps will clog up...

Throughout history it has been the inaction of those who could have acted, the indifference of those who should have known better, the silence of the voice of justice when it mattered most,that has made it possible for evil to triumph.HIM

And when you set it on at night, even with a peri pump, still set timer to not run continuously.
Personally i would go with a float switch, as evap rate varies from day to day.

Throughout history it has been the inaction of those who could have acted, the indifference of those who should have known better, the silence of the voice of justice when it mattered most,that has made it possible for evil to triumph.HIM

The new motor driven design of our stirrer silently and gently mixes your calcium hydroxide 24 hours a day. This ensures that you are always dosing the freshest possible kalkwasser to your system. Since the undissolved particles are always kept at the bottom and the clear liquid is always at the top, this is the safest available way to dose kalkwasser. Simple top load design reduces the amount of time spent adding kalk powder to the reactor, which can be refilled in less than 1 minute.

No more powerheads to clean or replace, no more large vats of lime water taking up valuable space next to your tank. Once you try our new line of stirrers you'll never look at kalkwasser the same again.

Note that our stirrers are non-pressurized chambers; water enters through a 1/4" John Guest fitting in the lid and gravity drains out into your sump through the 1/2" union barb fitting in the side. The lid is not fixed in place; it lifts off for quick and easy kalk powder refills.